The Kondo effect is a topic of interest in the condensed matter community due to the influence of strong many-body correlations. This effect arises from the exchange of electrons with a localized spin in metals and causes the emerging of a narrow peak in the density of states of the impurity. Quantum dots are perfect candidates to study this effect because they show Kondo physics and are easy to manipulate. In Ref. [1,2] we discussed the nonequilibrium thermoelectric properties of a Coulomb-blockaded quantum dot. Here, we study [3] the influence of the Kondo peak to the nonlinear thermoelectric transport in the high and low temperature regimes. We show that the Kondo peak seen in the spectral function causes a nontrivial zero in the thermocurrent and, consequently, in the thermovoltage. This nontrivial zero appears for a finite value of the applied thermal bias. At low temperatures, the Kondo temperature smears with increasing temperature differences and also renormalizes giving rise to nonlinear effects in the thermoelectric transport.
References [1] M. A. Sierra and D. Sánchez. Phys. Rev. B. 90, 115313 (2014) [2] M. A. Sierra and D. Sánchez. Materials Today: Proceedings. 2, 483 (2015) [3] M. A. Sierra, R. López and D. Sánchez. Unpublished (2015)